Installation, Important – Watts PLT User Manual

Page 2

Installation

1. Before beginning installation determine the

system pressure.

Open a faucet to allow the system pressure to equalize.

Read the system pressure at the Pressure Gauge
(Figure 1).

Close faucet.

2. The Expansion Tank Pre-Charge must be set to the system

pressure as determined in Step 1.
Note: The normal pre-charge is 20psi. Do not exceed 80
psi. If system pressure exceeds 80psi, it will be necessary
to either: A. Add a pressure Reducing Valve to the system
or, B. Locate the expansion tank in a riser where the static
pressure is below 80psi.

Unscrew the protective cap from the air inlet valve.

Using a tire pressure gauge check the tank pre-charge
pressure.

If necessary, pressurize the tank to the proper setting us-
ing a manual bicycle tire pump. Caution do not
exceed 80psi.

Replace the protective air cap.

3. Shut off the water supply valve.

4. Shut off power source to the hot water heater, (electricity,

gas, oil burner switch), and drain system following water
heater manufacturer recommendations.

5. Install the Expansion Tank in the System (refer to Figure 1).
a.

This Expansion Tank, as all Expansion Tanks, may even-
tually leak. Do not install without adequate
drainage provisions.

Note: Product information is subject to change without notice and
supersedes all previous publications.

Air Inlet
Valve Cap

Watts
Shutoff Valve

Watts
Backﬂ ow
Preventer

ater Pressure Gauge

Water Heater

Expansion

Tank

To System

Watts
T&P Safety
Relief Valve

Discharge Line

Watts Pressure
Reducing Valve

Figure 1

Water
Supply

Important!

•

A Pressure Relief Valve sized and installed in accordance
with Local Codes must be incorporated in the system.
In those systems requiring a combined Temperature and
Pressure Safety Relief Valve, the Temperature and Pressure
Safety Relief Valve should be sized and installed in accor-
dance with Local Codes.

•

Never plug a Safety Relief Valve.

6. Turn on the water supply valve.

7. Open a hot water ﬁ xture and allow water ﬂ ow until

all air is removed from the system.

8. Reapply power to the hot water heater.

9. Open a hot water ﬁ xture to allow a slight ﬂ ow until

the hot water has reached operating temperature.

10. Re-check system pressure following Step 1.a through c.

Caution: Do not adjust the air pre-charge of the Expansion
Tank with the system under pressure. The air pre-charge
should only be adjusted under zero system pressure.

If necessary adjust the Pressure Reducing Valve to the
Expansion Tank Pre-charge as determined in Step 2.

IS-PLT-35 0932

EDP#2915055

USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com

Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca

Limited Warranty: Watts Regulator Co. (the “Company”) warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of
original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge.
THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER
WARRANTIES, EXPRESS OR IMPLIED. THE COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company shall not be responsible for any incidental, special
or consequential damages, including without limitation, lost profits or the cost of repairing or replacing other property which is damaged if this product does not work properly, other costs resulting
from labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over which the Company has no
control. This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper maintenance or alteration of the product.
Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above
limitations may not apply to you. This Limited Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult applicable state laws to
determine your rights. SO FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF ORIGINAL SHIPMENT.

A Watts Water Technologies Company